Error in my Regular expression pattern

[shajiindia]

Hi Monks, I am using the following code and it gives a wrong result when run. I am trying to figure out but could not get the reason. Please help.

$_ = "Twinkle twinkle little star";

$n = m/twinkle/ig;
print "Number of occurences = $n\n";

while(/twinkle/ig) {
    $count++;
}

print "Found $count times\n";

When I run, it produces the following result

Number of occurences = 1
Found 1 times


but when I comment out lines 3 & 4 it gives the correct result. Why does the while loop produces the correct result when I comment out lines 3 & 4?

Found 2 times